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Add columns, modify column names, column properties, and delete column statements

Mysql modifies table name, column type, adds table column, deletes table column

Alter table test rename test1;-- modify the table name

Alter table test add column name varchar (10);-- add table columns

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Alter table test drop column name;-Delete table columns

Alter table test modify address char (10)-- modify the table column type

| | alter table test change address address char (40) |

Alter table test change column address address1 varchar (30)-- modify the table column name

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